KR20130075681A - Gas spring - Google Patents

Abstract

PURPOSE: A gas spring is provided to ensure the stabilization of operation properties. CONSTITUTION: A gas spring (11) comprises a cylinder (12), a piston (15), a rod (16), two disks (17,18), an oil seal (19), a rod guide (20), a rod side bracket (21), and a cylinder bracket. The cylinder seals liquid (L) and gas (G) to be mixable as a working fluid. The piston is inserted into the cylinder and partitions the inside of the cylinder into two chambers (13,14). One end of the rod is connected to the piston. The other end of the rod is protruded to the outside of the cylinder. The two disks are installed on the extension side of the rod from the piston. The oil seal seals a gap between the rod and the cylinder. The rod guide guides the rod from the outer position of the oil seal inside the cylinder. The rod side bracket is fixed to the other end of the rod. The cylinder side bracket is fixed to an end of the cylinder.

Description

Gas spring {GAS SPRING}

The present invention relates to a gas spring.

A gas and an oil are enclosed in a cylinder, the flow path which connects two chambers to the piston which divides into two chambers is provided, and this flow path opens and closes with the disk which has an orifice (for example, FIG. 4 of patent document 1). Reference).

Patent Document 1: Japanese Patent Application Laid-open No. 04-102734

In this gas spring, it is required to stabilize the operating characteristics when the attachment angle is changed.

Therefore, an object of the present invention is to provide a gas spring capable of stabilizing operating characteristics.

In order to achieve the above object, the present invention provides a piston or disc valve with a cutout portion for always communicating two chambers via a flow passage, and a restriction portion for regulating relative rotation with the rod, and in a use state with respect to the horizontal plane. The rod side bracket was attached to one side member, the cylinder side bracket was attached to the other side member, and the cutout part was arrange | positioned in the lower predetermined position of the said piston or the disc valve so that it may be inclined or parallel.

According to the present invention, it is possible to stabilize the operating characteristics.

1 is a cross-sectional view showing a gas spring in a use state of a first embodiment according to the present invention.
2 is an enlarged cross-sectional view showing a main part of a gas spring of a first embodiment according to the present invention.
3 is a cross-sectional view taken along line X1-X1 of FIG. 2 showing a rod and a disk of the first embodiment according to the present invention.
4 is an enlarged cross-sectional view showing a main part of a gas spring in a use state of the first embodiment according to the present invention.
FIG. 5 is a cross-sectional view taken along line X2-X2 of FIG. 4 showing a cylinder, a rod, and a disk of a gas spring in a use state of the first embodiment according to the present invention. FIG.
It is an expanded sectional drawing which shows the principal part of the gas spring of 2nd Embodiment which concerns on this invention.
FIG. 7 is a cross-sectional view X3-X3 of FIG. 6 showing a rod and a disk of the gas spring of the second embodiment according to the present invention. FIG.
8 is an enlarged cross-sectional view showing a main part of a gas spring of a third embodiment according to the present invention.
FIG. 9 is a cross-sectional view X4-X4 of FIG. 8 showing a rod and a piston of the gas spring of the third embodiment according to the present invention. FIG.
It is an expanded sectional drawing which shows the principal part of the gas spring of 4th Embodiment which concerns on this invention.
FIG. 11 is a cross-sectional view X5-X5 of FIG. 10 showing a rod, a piston and a disk of the gas spring of the fourth embodiment according to the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, each embodiment which concerns on this invention is described with reference to drawings.

"First embodiment"

1st Embodiment which concerns on this invention is described based on FIGS.

As shown in FIG. 1, the gas spring 11 of the first embodiment includes a cylinder 12 and a cylinder 12 in which liquid L, such as an emulsion, and gas G are encapsulated in a mixed manner as a working fluid. Is inserted into the cylinder 12 and divides the cylinder 12 into two chambers of the seal 13 and the seal 14, and one end is connected to the piston 15 and the other end protrudes out of the cylinder 12. The rod 16, the two disks 17 and 18 which are attached to the extension side of the rod 16 in the piston 15, and the oil which seals between the rod 16 and the cylinder 12. A seal 19, a rod guide 20 for guiding the rod 16 at a position outside the oil seal 19 in the cylinder 12, and a rod side bracket fixed to the other end serving as the protruding side of the rod 16 ( 21 and a cylinder side bracket 22 fixed to one end of the cylinder 12. The gas spring 11 of 1st Embodiment is a type which does not have a free piston in the cylinder 12. As shown in FIG. On the other hand, a coil spring may be provided in the seal 13 to supplement the gas spring force or to adjust the spring characteristics.

The cylinder 12 consists of a cylindrical cylinder main body 31 and the blocking member 32 which closes the one end side of the cylinder main body 31. As shown in FIG. The cylinder main body 31 is formed with an annular annular small diameter portion 33 which is recessed radially inwardly from the outer circumferential surface and protrudes radially inwardly from the inner circumferential surface at an intermediate position opposite to the closure member 32 and is the maximum length. At this time, the piston 15 is prevented from contacting the oil seal 19. In addition, the cylinder main body 31 has an annular annular step portion which is recessed in the radial direction from the outer circumferential surface and protrudes in the radial direction from the inner circumferential surface at the position of the opening 34 which is the end opposite to the closing member 32 ( 35 is formed and held so that the rod guide 20 does not come off from the cylinder 12. Both the annular small diameter part 33 and the annular step part 35 are formed by the caulking process to the cylinder main body 31. As shown in FIG.

The closure member 32 has a spherical shape, and is fixed to an end opposite to the opening portion 34 of the cylinder body 31 in a convex shape on the outside. The closure member 32 is welded to the end of the cylinder main body 31 without a clearance over the whole circumference. The through hole 38 is formed in the center of the closure member 32 so as to extend along this axial direction on the central axis of the cylinder main body 31.

The cylinder-side bracket 22 has an L-shape having a substrate portion 41 and an attachment plate portion 42 extending vertically from one edge portion of the substrate portion 41 to the substrate portion 41. An attachment shaft portion 43 protruding in a direction opposite to the attachment plate portion 42 is formed in the center of the portion 41. The attachment plate part 42 is provided with the attachment hole 44 which penetrates in the plate thickness direction. In the cylinder side bracket 22, the board | substrate part 41 is welded to the blocking member 32 without a clearance over the whole periphery, in the state which inserted the attachment shaft part 43 into the through-hole 38 of the cylinder 12. The closure member 32 and the cylinder main body 31 are welded, and the closure member 32 and the cylinder side bracket 22 are welded, and the cylinder 12 has the cylinder side bracket 22 side sealed by the axial direction. . The attachment plate part 42 is along the axial direction of the cylinder 12, and the attachment hole 44 is along the axial orthogonal direction of the cylinder 12. As shown in FIG.

As shown in FIG. 2, the piston 15 is held by the toroidal piston body 48 and the piston body 48 which are in sliding contact with the inside of the cylinder body 31 of the cylinder 12, and the piston body 48. ) And an O-ring 49 that seals the gap between the cylinder body 31. The piston body 48 has the same shape as the front and back, and a through hole 51 penetrating in the axial direction is formed in the center of the radial direction. The through hole 51 has a center in the axial direction as the small diameter hole 52, and both sides in the axial direction of the small diameter hole 52 have a larger diameter than the small diameter hole 52. Part 53 is made.

The piston body 48 is formed with an annular seal retaining groove 55 recessed radially inward in the axial center of the outer circumferential portion, and is radially inward from the seal retaining groove 55 than the through hole 51. On the radially outer side, a plurality of flow path holes 56 along the axial direction are formed at equal intervals in the circumferential direction. Further, in the piston body 48, an annular flow path groove 57 is concentric with the through hole 51 so as to connect all the flow path holes 56 on both sides of the flow path hole 56 in the axial direction. It is formed to be recessed. A plurality of flow path holes 56 and flow path grooves 57 on both sides are formed in the piston 15 to form a flow path 58 through which the working fluid flows when the piston 15 moves together with the rod 16. have. The piston 15 is arrange | positioned between the annular small diameter part 33 and the blocking member 32 in the cylinder 12 as shown in FIG. The annular small diameter portion 33 of the cylinder 12 restricts the movement of the piston 15 to the opening portion 34 side.

The rod 16 includes a main shaft portion 61 having a constant diameter, an intermediate shaft portion 62 having a smaller diameter than the main shaft portion 61 formed to be adjacent to one end side in the axial direction of the main shaft portion 61, and an intermediate shaft portion ( On the opposite side to the intermediate shaft portion 62 in the axial direction of the fitting shaft portion 63 and the smaller diameter than the intermediate shaft portion 62 formed to be adjacent to the opposite side to the main shaft portion 61 in the axial direction of the 62 (62). It has a larger diameter caulking part 64 than the fitting shaft part 63 formed so that it may adjoin.

As shown in FIG. 2, the intermediate shaft portion 62 has a larger diameter than the small diameter hole portion 52 of the through hole 51 of the piston 15 and a smaller diameter than the large diameter hole portion 53. The fitting shaft portion 63 is slightly smaller in diameter than the small diameter hole portion 52 so that the fitting shaft portion 63 can be fitted to the small diameter hole portion 52 of the through hole 51 of the piston 15. The caulking portion 64 has the same diameter as the fitting shaft portion 63 before caulking, and the intermediate shaft portion 62 contacts the bottom surface of the small diameter hole portion 52 side of one large diameter hole portion 53. Until the fitting shaft portion 63 is inserted into the small-diameter hole portion 52, the tip end side of the fitting shaft portion 63 is cocked. The caulking portion 64 has a larger diameter than the small diameter hole portion 52 and a smaller diameter than the large diameter hole portion 53. By forming the caulking portion 64, the piston 15 is brought into a state in which axial movement is restricted with respect to the rod 16. As shown in FIG. 1, the rod 16 protrudes out of the cylinder 12 through the oil seal 19 and the rod guide 20 in the main shaft portion 61.

As shown in FIG. 2, the disk 17 is able to contact the piston 15, and has comprised the annular shape in which the insertion through-hole 67 penetrated in the axial direction is formed in the center of the radial direction. This insertion hole 67 can penetrate the intermediate shaft portion 62 of the rod 16. As shown in FIG. 3, the notch part 68 of the shape which recessed in the radial direction from the outer peripheral part is formed in the radial direction outer side of this disk 17. As shown in FIG. In other words, the cutout portion 68 has a shape in which the cutout portion 68 is pulled outward along the radial direction of the disk 17 from the outer peripheral portion of the disk 17. The cutout portion 68 penetrates in the axial direction, that is, in the thickness direction of the disk 17.

As shown in FIG. 2, the disk 17 has a larger diameter than the maximum diameter of the flow path groove 57 of the piston 15, and the flow path groove 57 is in contact with the piston 15. To cover. As shown in FIG. 4, the outer diameter which becomes the minimum by forming the notch 68 of the disk 17 is smaller than the maximum diameter of the flow path groove 57. As shown in FIG. Therefore, the disk 17 contacts the piston 15 to close the flow path 58 except for the cutout 68, and the cutout 68 always opens the flow path 58. As shown in FIG.

As shown in FIG. 2, the disk 18 is a circle | round | yen with which the disk 17 was able to contact from the opposite side to the piston 15, and the insertion through-hole 69 penetrated in the axial direction in the center of the radial direction is formed. It is ring-shaped. The disk 18 can penetrate the intermediate shaft portion 62 of the rod 16 into the insertion through hole 69, and the outer diameter of the disk 18 is the same diameter as the outer diameter of the disk 17. have. On the other hand, the sum of the axial length (thickness) of the disk 17 and the axial length (thickness) of the disk 18 is smaller than the amount of protrusion from the piston 15 of the intermediate shaft portion 62 of the rod 16. Thus, the disks 17 and 18 are able to move in the axial direction with respect to the piston 15 and the rod 16 by the guide of the intermediate shaft portion 62 of the rod 16. On the other hand, the disks 17 and 18 may be made unable to move axially with respect to the piston 15 and the rod 16, and the flow path 58 may be opened or closed by bending.

The disk 17 and the disk 18 constitute an annular disk valve 70 that opens and closes the flow path 58 of the piston 15. As shown in FIG. 4, in the state where the disk 17 is in contact with the piston 15, the disk valve 70 opens the flow path 58 of the piston 15 by the notch 68 and the flow path groove. Except for the orifice 71 consisting of the communication port of 57, it is in the closed state, and the movement of a fluid is allowed through this orifice 71 only. As a result, the flow path resistance of the fluid is increased, and the damping force is increased. At this time, the orifice 71 becomes an opening of one end of the flow path 58. On the other hand, the disk valve 70 allows the movement of the fluid through the entirety of the flow path 58 when the disk 17 opens the flow path 58 away from the piston 15. This reduces the flow path resistance of the fluid and lowers the damping force. This adjustment of the damping force controls the speed of movement of the rod 16 relative to the cylinder 12. The notch 68 formed in the disk 17 of the disk valve 70 always communicates the two chambers of the chamber 13 and the chamber 14 via the flow path 58.

As shown in FIG. 1, in the rod guide 20, an insertion through hole 74 penetrating in the axial direction is formed in the center of the radial direction, and the large diameter portion 75 and the large diameter portion are located outside the radial direction. The medium diameter part 76 of a smaller diameter than 75, and the small diameter part 77 of a smaller diameter than the intermediate diameter 76 are formed one by one. The rod guide 20 fits the cylinder 12 before caulking in the large diameter part 75 in the state which penetrated the rod 16 in the insertion hole 74. In this state, when the end part of the opening part 34 side of the cylinder 12 is cocked and the annular step part 35 is formed, this annular step part 35 couples to the intermediate diameter part 76, and the rod guide ( 20 is fixed to the cylinder 12.

The oil seal 19 has an annular base 80, an annular inner lip 81 extending radially one side from the base 80 in the radially inner side, and a base 80 in the radially outer side. ), It has an annular outer lip portion 82 extending to the same side as the inner lip portion 81 in the axial direction. The oil seal 19 comes into contact with the large diameter portion 75 side of the rod guide 20 in the base 80, and in this state, the rod 16 is inserted into the inner lip portion 81. The outer lip 82 is fitted to the cylinder 12. Thus, the oil seal 19 seals between the rod 16 and the cylinder 12.

The rod-side bracket 21 has an L-shape having a substrate portion 85 and an attachment plate portion 86 extending vertically from one edge of the substrate portion 85 to the substrate portion 85. The plate part 86 is provided with the attachment hole 87 penetrating in the plate thickness direction. On the rod side bracket 21, the end opposite to the piston 15 in the axial direction of the rod 16 is fixed to the opposite side to the attachment plate portion 86 of the substrate portion 85 by welding. The attachment plate portion 86 follows the rod 16 in the axial direction, and the attachment hole 87 follows the direction perpendicular to the axial direction of the rod 16.

And in 1st Embodiment, as shown in FIG.2 and FIG.3, the outer peripheral surface of the intermediate shaft part 62 of the rod 16 follows the cylinder centered on the central axis of the rod 16 along an axial direction. D cut which consists of the flat surface 96 parallel to the central axis of the rod 16 which connects the principal surface part 95 of the shape partially cut off at the surface, and the parallel both edges of the cut-out side of the principal surface part 95. It is shaped. Here, as shown in FIG. 1, the flat surface 96 of the rod 16 is a rod side bracket (so that it may be upward when it attaches to the attachment object in the rod side bracket 21 fixed to the rod 16. As shown in FIG. The phase relationship with 21 is determined. That is, the rod side bracket 21 is attached to the attachment object so that the flat surface 96 of the rod 16 may be upward.

As shown in FIG. 3, in accordance with the above, the inner circumferential surface of the insertion through hole 67 through which the rod 16 of the disk 17 is inserted is axially oriented in a cylinder centered on the central axis of the disk 17. A planar surface 99 parallel to the central axis of the disk 17, which connects the major surface portion 98 of the notched shape and the parallel both edges on the cutout side of the principal surface portion 98 in a plane along the surface thereof. D-shaped. The insertion through hole 67 is formed to be slightly larger in diameter than the main surface portion 95 so that the main surface portion 98 can penetrate the main surface portion 95 of the intermediate shaft portion 62 of the rod 16. The diameter of the main shaft portion 61 is smaller than that of the main shaft portion 61 so as not to escape from the intermediate shaft portion 62 toward the main shaft portion 61 shown in FIG. 2. 3, the distance from the central axis of the disk 17 of the flat surface 99 can oppose the flat surface 96 of the rod 16, and the flat surface 96 of the rod 16 will be described. ), It is formed slightly longer than the distance from the central axis of the rod 16 to the flat surface 96 so that rotation with respect to the rod 16 is restricted by contact with.

In other words, the disk 17 is positioned so that the flat surface 96 is opposed to the flat surface 99 so as to penetrate the intermediate shaft portion 62 of the rod 16 so that the positioning in the rotational direction with respect to the rod 16 is reduced. In this way, the relative rotation relative to the rod 16 is regulated. The flat surface 96 of the rod 16 and the flat surface 99 of the disk 17 determine the position in the rotational direction of the disk 17 and the rod 16 to regulate relative rotation of the disk 17. The restriction | limiting part 101 which comprises the axial movement with respect to the rod 16 is comprised.

The flat surface 99 of the disk 17 is formed at a position 180 degrees different from the one cutout 68 in the circumferential direction of the disk 17. Therefore, as shown in FIG. 1, the notch 68 of the disk 17 is rod-side bracket (when attaching to the attachment object in the rod-side bracket 21 fixed to the rod 16 so that it may become downward. The phase relationship with 21 is determined.

As shown in FIG. 2, the insertion hole 69 of the disk 18 in contact with the disk 17 has a cylindrical shape over its entire circumference, and the intermediate shaft portion 62 of the rod 16 is inserted. It is formed slightly larger in diameter than the main surface part 95 so that it can penetrate, and is made smaller in diameter than the main shaft part 61 so that it may not escape to the main shaft part 61 side from the intermediate shaft part 62. FIG.

As shown in FIG. 1, such a gas spring 11 is mounted and used between the rotatable attachment portion 111 of one side member 110 and the rotatable attachment portion 113 of the other side member 112. . At this time, the mounting plate portion 86 of the rod-side bracket 21 is brought into contact with the seat surface 115 of the mounting portion 111 on the contact surface opposite to the extending side of the base plate portion 85 in the thickness direction, In this state, the nut 117 is screwed to the screw shaft portion 116 of the attachment portion 111 projecting from the attachment hole 87, so that the nut 117 is sandwiched between the nut 117 and the seat surface 115. Similarly, the attachment plate portion 42 of the cylinder-side bracket 22 is in contact with the seat surface 119 of the attachment portion 113 on the contact surface opposite to the extension side of the substrate portion 41 in the thickness direction, for example. In this state, the nut 121 is screwed to the screw shaft portion 120 of the attachment portion 113 protruding from the attachment hole 44, thereby being sandwiched between the nut 121 and the seat surface 119. The gas spring 11 is attached to the attachment part 111 of the one side member 110 in the rod side bracket 21 as mentioned above, and the attachment part of the other member 112 in the cylinder side bracket 22. In 113, it is determined to adhere as described above.

In addition, the gas spring 11 is moved by the attachment portion 111 of the one side member 110 and the attachment portion 113 of the other member 112 relative to each other, so that the gas spring 11 is a cylinder of the rod 16. The extension stroke from which the protrusion amount from (12) increases and extends as a whole, and the contraction stroke which the protrusion amount from the cylinder 12 of the rod 16 decreases and decreases as a whole, are rocked as a whole.

On the other hand, when the gas spring 11 is installed in a window such as a flue gas window with a hinge on the upper side, the gas spring 11 is in a vertical state with a minimum length when it is closed. It becomes the photograph state. As described above, the gas spring is generally changed in the attachment angle from the minimum length to the maximum length depending on the attachment method and the installation place. There are rare cases where the angle is used without changing the angle. As described above, when the attachment part 111 of the one side member 110 and the attachment part 113 of the other member 112 move in the entire range of relative movement, they are inclined or parallel to the horizontal plane at any position. There is. On the other hand, when the line connecting the attachment portion 111 and the attachment portion 113 is inclined with respect to the horizontal plane, the attachment portion 111 is attached downward so that the attachment portion 113 is upward.

That is, when the gas spring 11 is in a use state attached to the attachment portion 111 of the one side member 110 and the attachment portion 113 of the other member 112 in a predetermined posture as described above, FIG. 4. As shown in FIG. 13, the disks 17 and 18 are lowered with respect to the piston 15, and the cutout 68 of the disk 17 is located at the lower portion of the disk valve 70 including the disk 17. It is in a state arranged at a predetermined position, specifically, at the lower end position of the disk 17. Further, when in this use state, in the insertion through hole 67 of the disk 17, the flat surface 99 constituting the restricting portion 101 is disposed at a predetermined position in the upper portion, specifically, in an upper position. It becomes a state.

In the gas spring 11, the liquid L and the gas G are enclosed in the cylinder 12. When the amount of the liquid L is in the above-described use state, the liquid L and the gas G may be in any position in the swing range. As shown in FIG. 4 and FIG. 5, it is set at least by the amount which the liquid L contacts the notch 68.

When the gas spring 11 moves away from the position where the attachment part 111 of the one side member 110 and the attachment part 113 of the other member 112 are closest in the above-mentioned use state, the rod 16 Is an extension stroke extending from the cylinder 12. In the initial stage, the piston 15 and the disk valve 70 are above the liquid L in the cylinder 12, and the disks 17 and 18 are spaced downward from the piston 15. When the piston 15 narrows the lower chamber 14, the gas G of the chamber 14 flows into the chamber 13 through the flow path 58.

Thereafter, the disk valve 70 composed of the disks 17 and 18 is pushed up in contact with the liquid L below the gas G to come into contact with the piston 15 in the disk 17. The orifice 71 is formed at the lower end position of the flow path 58. As long as the expansion stroke continues, the disk valve 70 in the state of contacting the piston 15 is in a state in which the pressure of the seal 14 is higher than the pressure of the seal 13 and the contact state to the piston 15 is maintained. In the subsequent stretching stroke, the liquid L flows from the yarn 14 to the yarn 13 via the orifice 71, so that the damping force is increased.

When the disk valve 70 is in contact with the liquid L described above, the cutout 68 of the disk 17 is located at the lower end position of the disk 17, so that the liquid L is in contact with the liquid L. The orifice 71 formed in the cutout 68 by the contact with the piston 15 is also located at the lower end position of the flow path 58, so that when the liquid L starts to flow through the orifice 71, the rod ( The position with respect to the cylinder 12 of 16 is constant.

On the other hand, when the attachment part 111 of the one side member 110 and the attachment part 113 of the other member 112 are close to the most spaced apart position, the gas spring 11, the rod 16 is the cylinder 12 ) Is the contraction stroke entering. In this contraction stroke, since the pressure of the chamber 14 decreases and the pressure of the chamber 13 rises, the liquid L in the chamber 13 separates the disks 17 and 18 from the piston 15. It flows into the chamber 14 through the flow path 58 wider than the orifice 71, and the damping force falls.

In the above-described Patent Document 1, since the cutout position is not determined, the stroke range with a high damping force varies when the cutout becomes the upper side and the lower side, so that when the operating characteristic varies depending on the individual difference of the product, Product quality is impaired.

In contrast, in the gas spring 11 of the first embodiment, as described above, the gas G flows from the chamber 14 to the chamber 13 through the flow path 58 in the stretching stroke. The disk L is brought into contact with the piston 15 by the liquid L, so that the orifice 71 for flowing the liquid L from the chamber 14 to the chamber 13 is formed in the flow path 58. . At this time, since the cutout portion 68 constituting the orifice 71 is always arranged at the lower end position of the disk 17, the orifice 71 is also arranged at a predetermined position, so that the liquid L is orifice 71. The position with respect to the cylinder 12 of the rod 16 becomes constant when it starts to flow. That is, if the disk 17 is rotatable with respect to the rod 16 and the cutout 68 is not at a certain position, the position of the orifice 71 is not constant, and the liquid L starts to flow through the orifice 71. When the position (dumping start position) of the rod 16 with respect to the cylinder 12 at the time is not constant, expansion speed will not be constant but will fluctuate, but with the gas spring 11 of 1st Embodiment, Things won't happen. Thus, according to this gas spring 11, stabilization of an operating characteristic can be aimed at.

In addition, since the liquid L in the working fluid is enclosed in the cylinder 12 at least in contact with the cutout 68 in the above-described use state, the orifice 71 formed by the cutout 68 is removed. The state in which the liquid L flows is generated, thereby increasing the effect of stabilizing the operating characteristics.

In addition, the regulating portion 101 for restricting the rotation of the disk 17 relative to the rod 16 is constituted by the flat surface 96 of the rod 16 and the flat surface 99 of the disk 17. Since the direction of the liquid L at the beginning of the stretching stroke is in the opposite direction (upper side) with respect to the liquid surface (lower side), the sliding movement to the rod 16 of the disk 17 can be improved in the stretching stroke. This means that when the piston 15 enters the liquid L with an inclination with respect to the liquid surface in the expansion stroke, the disk 17 is likewise inclined and pushed upward by the liquid L, and the flat surface 99 This is because the slides with respect to the rod 16 while being spaced apart from the flat surface 96 of the piston 15. In other words, when the flat surface 96 and the flat surface 99 are at the lower side, the flat surface 96 and the flat surface 99 are slid when the disk 17 is pushed upward by the liquid L. As a result, the contact area increases and the sliding resistance increases, which may hinder the sliding movement. However, the increase in the sliding resistance can be suppressed in the gas spring 11 of the first embodiment.

"2nd Embodiment"

Next, 2nd Embodiment is described mainly based on the part different from 1st Embodiment based on FIG. 6 and FIG. In addition, about the site | part common in 1st embodiment, it shows with the same code | symbol and the same code | symbol.

In the second embodiment, the disc 17 of the disc 17 is regulated by positioning the disc 17 and the rod 16 by the restricting unit 131 different from the restricting unit 101 of the first embodiment. It is adapted to allow axial movement with respect to the rod 16. In other words, the restricting portion 131 includes a groove portion 132 formed so as to dent into the intermediate shaft portion 62 of the rod 16 in the radial direction and extend in the axial direction, and the insertion hole 67 of the disk 17. It is comprised by the projection part 133 which protrudes radially inward from an inner peripheral surface.

That is, the intermediate shaft part 62 of the rod 16 of 2nd Embodiment has the principal surface part 135 and the principal surface of the shape which cut | disconnected the cylinder centered on the central axis of the rod 16 along the axial direction. Of two groove wall surfaces 136 extending radially inwardly of the rod 16 from each of the parallel opposite end portions of the cut-out side of the portion 135 and the rods 16 of the two groove wall surfaces 136. The groove bottom surface 137 which connects inner edge edge part in radial direction is provided, and the groove wall surface 136 and the groove bottom surface 137 of both sides comprise the groove part 132. As shown in FIG. Here, the groove portion 132 is in phase with the rod side bracket 21 so as to be upward when attached to the one-side member 110 by the rod side bracket 21 (see FIG. 1) fixed to the rod 16. The relationship is fixed.

As described above, in the disk 17 of the second embodiment, the inner circumferential surface of the insertion through hole 67 through which the rod 16 is inserted is axially oriented in a cylinder centered on the central axis of the disk 17. Main surface portion 140 of the notch shape and the two curved surface portion 141 connected from the tip side while extending inward in the radial direction from both parallel edges of the notch side of the main surface portion 140 in the plane along the The two curved surface portions 141 constitute the outer surface of the protrusion 133.

The insertion hole 67 of the disk 17 is formed so that the main surface portion 140 is slightly smaller than the main surface portion 135 so that the main surface portion 140 of the disk 17 can pass through the main surface portion 135 of the intermediate shaft portion 62 of the rod 16 And has a smaller diameter than the main shaft portion 61 so as not to escape from the intermediate shaft portion 62 toward the main shaft portion 61 side. The main surface portion 135 of the intermediate shaft portion 62 of the rod 16 is inserted into the main surface portion 140 of the insertion hole 67 of the disk 17 while inserting the protrusion portion 133 into the groove portion 132. When penetrated, the relative rotation of the disk 17 and the rod 16 is regulated by the projection 133 contacting the groove 132, and the axial movement of the disk 17 with respect to the rod 16 is the projection 133. ) Is allowed to move in the groove 132.

The projection 133 of the disk 17 is formed at a position 180 degrees different from the cutout 68 in the circumferential direction of the disk 17. Therefore, similarly to the first embodiment shown in FIG. 1, when the rod side bracket 21 is attached to one side member 110 and the cylinder side bracket 22 is attached to the other side member 112, the rod side bracket 21 is shown in FIG. 7. The protruding portion 133 of the disk 17 is disposed above, and the cutout portion 68 is positioned at the lower end position of the disk 17 as in the first embodiment.

According to the second embodiment described above, the restricting portion 131 which moves the disk 17 having the cutout portion 68 in the axial direction while determining the position of the rotational direction with respect to the rod 16 and regulating relative rotation is provided. And the groove 132 and the protrusion 133, the relative rotation can be satisfactorily regulated even if the length in the circumferential direction thereof is reduced. Therefore, since the length in the circumferential direction of the other cylindrical main surface parts 135 and 140 can be ensured, the disk 17 can be moved with respect to the rod 16 more smoothly.

&Quot; Third Embodiment "

Next, 3rd Embodiment is described mainly based on the part different from 1st Embodiment based on FIG. 8 and FIG. In addition, about the site | part common in 1st embodiment, it shows with the same code | symbol and the same code | symbol.

In 3rd Embodiment, the notch part 68 of 1st Embodiment is not formed in the disk 17 which comprises the disk valve 70 shown in FIG. 8, but is formed in the inner peripheral surface of the insertion through-hole 67. As shown in FIG. The flat surface 99 of 1st Embodiment is not formed, either. That is, as for the disk 17, the whole outer peripheral surface has the cylindrical surface shape, and the whole inner peripheral surface of the insertion through-hole 67 also has the cylindrical surface shape. In addition, the disk 18 of 1st Embodiment is not provided, and only the disk 17 is provided in the intermediate shaft part 62 of the rod 16 so that an axial movement is possible.

In addition, in 3rd Embodiment, as shown in FIG. 9, the notch part which communicates the flow path groove 57 radially outward at the position of the flow path groove 57 of the piston main body 48 of the piston 15 ( 151 is formed. The cutout 151 and the disk 17 shown in FIG. 8 come into contact with each other so that an orifice 152 for always communicating the yarn 13 and the yarn 14 through the flow path 58 is formed therebetween. do.

In addition, in 3rd Embodiment, the flat surface 96 of 1st Embodiment is not formed in the intermediate shaft part 62 of the rod 16. As shown in FIG. That is, the outer peripheral surface of the intermediate shaft part 62 of the rod 16 has the cylindrical surface as a whole. On the other hand, the outer circumferential surface of the fitting shaft portion 63 of the rod 16 has a main surface portion 155 and a main surface portion having a shape in which the cylinder centered on the central axis of the rod 16 is partially cut along the axial direction. The D cut shape which consists of the flat surface 156 parallel to the central axis of the rod 16 which connects the parallel both edges of the cutting side of 155 is performed. Here, the flat surface 156 of the rod 16 is a rod side bracket () so as to be upward when attached to one side member 110 in the rod side bracket 21 (see FIG. 1) fixed to the rod 16. The phase relationship with 21 is determined. That is, the rod 16 is attached so that the flat surface 156 is upward when attached.

In accordance with the above, the inner circumferential surface of the small-diameter hole portion 52 of the through hole 51 of the piston 15 has a shape that is partially cut in a plane along the axial direction of the cylinder centered on the central axis of the piston 15. The D-shape which consists of the flat surface 161 parallel to the central axis of the piston 15 which connects the main surface part 160 and the parallel both edges of the cutting side of the main surface part 160 is performed. The small diameter hole portion 52 has a slightly larger diameter than the main surface portion 155 so that the main surface portion 160 can penetrate the main surface portion 155 of the fitting shaft portion 63 of the rod 16. Formed. In addition, the distance from the central axis of the piston 15 of the flat surface 161 can be opposed to the flat surface 156 of the rod 16 and the relative rotation is regulated by contacting the flat surface 156 of the rod 16. The length of the rod 16 is slightly longer than the distance from the central axis of the rod 16 to the flat surface 156. That is, the piston 15 inserts the fitting shaft portion 63 of the rod 16 so that the flat surface 161 faces the flat surface 161 so that the positioning in the rotational direction with respect to the rod 16 can be achieved. As a result, relative rotation to the rod 16 is restricted. The regulating part 163 which the flat surface 156 of the rod 16 and the flat surface 161 of the piston 15 determines the position of the rotation direction of the piston 15 and the rod 16, and restricts relative rotation. It consists of.

The flat surface 161 of the piston 15 is formed at a position 180 degrees different from the cutout portion 151 described above in the circumferential direction of the piston 15. Therefore, similarly to the first embodiment shown in FIG. 1, when the rod side bracket 21 is attached to one side member 110 and the cylinder side bracket 22 is attached to the other side member 112, the rod 16 is flat. The surface 156 is upward, so that the flat surface 161 of the piston 15 is upward in the small diameter hole 52, and the cutout 151 of the piston 15 is It is arrange | positioned at the lower predetermined position, and falls downward along the radial direction of the piston 15 from the lower end of the flow path 58. As shown in FIG. As a result, the orifice 152 formed by the notch 151 of the piston 15 and the disk 17 is located at the lower end position of the disk 17 as in the first embodiment.

According to the third embodiment described above, the notch 151 constituting the orifice 152 is formed in the piston 15, so that the disk 17 is provided with respect to the piston 15 and the rod 16. It is not necessary to regulate relative rotation, and the entire inner circumferential surface of the insertion through hole 67 of the disk 17 and the entire outer circumferential surface of the intermediate shaft portion 62 of the rod 16 can each have a cylindrical surface shape. Thus, the disk 17 can be moved more smoothly with respect to the rod 16.

&Quot; Fourth embodiment "

Next, 4th Embodiment is described mainly based on the part different from 1st, 3rd Embodiment based on FIG. 10 and FIG. In addition, about the site | part common in 1st, 3rd embodiment, it shows with the same code | symbol and the same code | symbol.

In the fourth embodiment, similarly to the third embodiment, the outer circumferential surface of the fitting shaft portion 63 of the rod 16 has a D cut shape consisting of the main surface portion 155 and the flat surface 156, and the piston ( The inner circumferential surface of the small-diameter hole portion 52 through which the fitting shaft portion 63 of 15 is inserted has a D-shape consisting of the main surface portion 160 and the flat surface 161. Then, with the restricting portion 163 composed of the flat surface 156 of the rod 16 and the flat surface 161 of the piston 15, the position of the rotational direction with respect to the rod 16 of the piston 15 is determined. Relative rotation is regulated.

The flat surface 96 of the first embodiment is not formed on the intermediate shaft portion 62 of the rod 16 as in the third embodiment. In accordance with this, the flat surface 99 of the first embodiment is not formed on the inner circumferential surface of the insertion through hole 67 of the disk 17. In other words, the entire outer circumferential surface of the intermediate shaft portion 62 of the rod 16 has a cylindrical surface shape, and the entire inner circumferential surface of the insertion through hole 67 of the disk 17 has a cylindrical surface shape. On the other hand, the notch part 68 like 1st Embodiment is formed in the outer peripheral part of the disk 17. As shown in FIG.

And in the 4th Embodiment, the convex part 171 which protrudes to the seal 14 side of the axial direction, ie, the disk valve 70 side, is formed in one part of the outer peripheral part of the piston 15. As shown in FIG. The convex part 171 is provided with the flat surface 172 orthogonal to the radial direction of the piston 15 inside the b piston 15 in the radial direction. The position of this flat surface 172 is 90 degrees different from the position of the flat surface 161 which comprises the restricting part 163.

In accordance with the convex portion 171, the outer circumferential surface of the disk 17 has a main surface portion 174 and a main surface portion having a shape in which the cylindrical portion centered on the central axis of the disk 17 is partially cut along the axial direction. It consists of the flat surface 175 parallel to the central axis of the disk 17 which connects the parallel both edges of the cutting side of 174, and the cutout part 68 is formed in the position of the principal surface part 176. . The outer circumferential surface of the disk 18 is also similarly formed on the cutout side of the main surface portion 176 and the main surface portion 176 of the shape in which the cylinder centered on the central axis of the disk 18 is partially cut along the axial direction. It consists of a flat surface 177 parallel to the central axis of the disk 17, which connects parallel edges at both ends.

The disk 17 has the flat surface 175 of the convex portion 171 of the piston 15 having the flat surface 175 in the state where the intermediate shaft portion 62 of the rod 16 is inserted through the insertion through hole 67. 172, which is thereby positioned relative to the piston 15 in the rotational direction to restrict relative rotation. The disk 18 also has the flat surface 177 of the convex portion 171 of the piston 15 with the flat surface 177 in the state where the intermediate shaft portion 62 of the rod 16 is inserted through the insertion through hole 69. 172, which is thereby positioned relative to the piston 15 in the rotational direction to restrict relative rotation. In other words, the flat surface 172 of the convex portion 171 of the piston 15 and the flat surfaces 175 and 177 of the disks 17 and 18 are the piston 15 and the disks 17 and 18, that is, the disk valve. A restricting portion 178 is provided to allow the axial movement of the disk valve 70 to the piston 15 and the rod 16 while determining the position of the rotational direction of 70 and regulating relative rotation.

The flat surface 175 of the disk 17 is formed at a position 90 degrees different from the one cutout 68 in the circumferential direction of the disk 17, and the flat surface 175 is connected to the piston 15. When it is opposed to the flat surface 172 of the convex portion 171, the cutout portion 68 is positioned 180 degrees different from the flat surface 161 of the piston 15 and the flat surface 156 of the rod 16. Will be placed. Therefore, similarly to the first embodiment shown in FIG. 1, when the rod side bracket 21 is attached to one side member 110 and the cylinder side bracket 22 is attached to the other side member 112, the notch portion 68 is provided. Is located at the bottom position of the disk 17.

According to the fourth embodiment described above, the piston 15 is provided with a restricting portion 178 which allows the axial movement while determining the position of the rotational direction with respect to the piston 15 of the disk 17 and regulating relative rotation. Since it is formed by the flat surface 172 of the convex part 171, manufacture becomes easy.

On the other hand, the gas spring 11 of 1st-4th embodiment is used when opening and closing a flue gas window, the engine hood of a construction machine, the door for facility maintenance, etc., for example.

Embodiments described above are a gas spring mounted between one side member and the other member, a cylinder in which gas and a liquid are sealed as working fluid, a piston inserted into the cylinder, and partitioning the cylinder into at least two chambers; A rod having one end connected to the piston and the other end protruding to the outside of the cylinder, a flow path provided in the piston, through which the working fluid flows when the rod moves, and the rod inserted into the flow path. An annular disk valve for opening and closing, a rod side bracket provided at the other end of the rod and attached to the one side member, and a cylinder side bracket provided at one end of the cylinder and attached to the other side member; Alternatively, the disc valve has a cutout portion which always communicates the two chambers via the flow passage, and an image of the rod. A regulating portion for regulating the large rotation is provided, and in the use state, the rod side bracket is attached to the one side member, the cylinder side bracket is attached to the other side member, so that the rod side bracket is inclined or parallel to the horizontal plane, and the cutout portion is It was set as the structure arrange | positioned in the lower predetermined position of a piston or the said disc valve. Therefore, the position of the rod with respect to the cylinder when the liquid starts to flow into the flow passage through the cutout portion is set to be smaller than the position of the rod with respect to the cylinder It becomes constant. Therefore, stabilization of operating characteristics can be attained.

Moreover, the said working liquid was set as the structure enclosed in the said cylinder so that it may contact at least the said cutout part in the said use state. Therefore, the liquid flows in the flow path through the cutout, so that the effect of stabilizing the operating characteristics is increased.

11: gas spring 12: cylinder
13, 14: seal 15: piston
16: rod 21: rod side bracket
22 cylinder side bracket 58 flow path
68: cutout 70: disc valve
101, 131, 163, 178: regulator 110: one side member
112: the other side

Claims (4)

As a gas spring mounted between one side member and the other side,
A cylinder into which gas and liquid are enclosed as working fluids,
A piston inserted into the cylinder and partitioning the cylinder into at least two seals,
A rod having one end connected to the piston and the other end protruding out of the cylinder,
A flow path provided in the piston and through which the working fluid flows when the rod moves;
An annular disk valve through which the rod is inserted to open and close the flow path;
A rod side bracket provided at the other end of the rod and attached to the one side member;
A cylinder side bracket provided at one end of the cylinder and attached to the other side member
/ RTI >
The piston or the disc valve is provided with a cutout portion for always communicating the two chambers through the flow passage, and a restriction portion for regulating relative rotation with the rod,
In use, the rod side bracket is attached to the one side member, the cylinder side bracket is attached to the other side member, and the cutout portion is lower than the piston or the disc valve so that the cylinder is inclined or parallel to a horizontal plane. Gas spring, characterized in that arranged in the position. The gas spring according to claim 1, wherein the liquid is enclosed in the cylinder at least in contact with the cutout portion in the use state. The gas spring according to claim 1, wherein the cutout is provided on a radially outer side of the disk valve and is recessed inward from the outer circumferential side of the disk valve. The gas spring according to claim 1, wherein the cutout portion is formed by communicating the flow path of the piston in a radially outer side.

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